
public class testInterface {
  public static void main(String[] args){
	  EnvInterface.print();
	  Company com=new Company();
	  addProvider(com);
	  com.say();
	  College col=new College();
	  addProvider(col);
  }
  public static void addProvider(EnvInterface envInterface){
	 envInterface.clean();
	 envInterface.recycle();	
  }
}
